yardage requirements...
there are never any pieces bigger than 3" and 2.5 is more the standard in Bonnies quilts.
On all 4 sides of that 2.5" block is 1/4" of seam...1 inch of fabric, buried in the back.. My dear Jane quilt took just shy of 15.5 yards of fabric. Little pieces = tons of seams allowances
And Bonnie always gives some wiggle room in the yardage requirements. Be patient, be brave
it will all be fine